Journal
BIOLOGICAL CONSERVATION
Volume 128, Issue 4, Pages 576-581Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biocon.2005.10.013
Keywords
abundance; population survey; Hector's dolphin; gillnet; fisheries bycatch
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Hector's dolphin Cephalorhynchus hectori is found only in New Zealand waters. We carried out a population survey of the North Island subspecies Cephalorhychus hectori maui, also known as Maui's dolphin. The total population size estimate is ill individuals (95% confidence interval = 48-252). The small population size confirms its critically endangered IUCN status. A sustainable level of human-caused mortality for this population would be 0.16 (one dolphin every 6.4 years). This essentially means that fisheries bycatch, and where possible other human impacts, need to be eliminated to allow population recovery. A protected area has been created to reduce the threat from entanglement in fishing gear. Gillnet fishing is prohibited along a 210 nautical mile stretch of coastline. The main concerns are that gillnet fishing is still allowed inside harbours and trawling continues inside the protected area. (c) 2005 Elsevier Ltd. All rights reserved.
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